HTML5 AAC Audio Playback Tests - MPEG-D DRC Metadata

Fraunhofer Institute for Integrated Circuits

General

This page tests if an xHE-AAC decoder correctly applies MPEG-D DRC audio-specific metadata, including program reference level, dynamic range control and downmixing. It consists of a number of xHE-AAC bitstreams, designed in a way that allows for a rough verification of these features by simply listening to the decoder output.

Note that this page does not test the legacy metadata introduced for use with AAC-LC and HE-AAC.

Test 1: Loudness Normalization Test

Audio

Noise signal

Test

Two items which test whether the decoder applies loudness normalization according to ISO/IEC 23003-4.

Expected Output

If the decoder correctly applies loudness normalization, the two test items are reproduced at equal level. If the decoder does not apply loudness normalization, the two test items are reproduced at different levels.

Test 4: Limiter Test

Audio

Modulated sine wave with low-level harmonic distortion

Test

This item tests whether the decoder applies peak limiting.

Expected Output

If the decoder correctly applies peak limiting, a modulated sine wave with low-level harmonic distortion is reproduced. If the decoder does not apply peak limiting, a modulated sine wave with high-level harmonic distortion is reproduced.